(1) The co-owners of the apartments are bound to contribute pro rata toward the expenses of administration and of maintenance and repair of the general common elements, and, in the proper case, of the limited common elements, of the building, and toward any other expense lawfully agreed upon.
(2) No co-owner may be exempted from contributing toward the expenses in subsection (a) by waiver of the use or enjoyment of the common elements or by abandonment of the apartment belonging to that co-owner or by any other means.